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ECE :: Digital Electronics

  1. Binary number 1101101101 is equal to decimal number

  2. A.
    3289
    B.
    2289
    C.
    1289
    D.
    289

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  3. A 16:1 multiplexer has 4 select input lines.

  4. A.
    True
    B.
    False

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  5. Which one of the following can be used as parallel to series converter?

  6. A.
    Decoder
    B.
    Digital counter
    C.
    Multiplexer
    D.
    Demultiplexer

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  7. What will be conversion time of a successive approximation A/D converter which uses 2 MHz clock and 5 bit binary ladder containing 8 V reference.?

  8. A.
    2.5 μ sec
    B.
    25 μ sec
    C.
    3 μ sec
    D.
    4 μ sec

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  9. A 4 bit down counter can count from

  10. A.
    0000 to 1111
    B.
    1111 to 0000
    C.
    000 to 111
    D.
    111 to 000

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  11. Assertion (A): In computers the data is stored in hexadecimal form

    Reason (R): Hexadecimal representation is short as compared to binary representation.

  12. A.
    Both A and R are correct and R is correct explanation of A
    B.
    Both A and R are correct but R is not correct explanation of A
    C.
    A is true, R is false
    D.
    A is false, R is true

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  13. For the circuit of the given figure, the output equation is

  14. A.
    Y = ABCD
    B.
    Y = AB + CD
    C.
    Y = A + BCD
    D.
    Y = ABC + D

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  15. Using 2's complement, the largest positive and negative number which can be stored with 8 bits are

  16. A.
    +128 and -127
    B.
    +128 and -128
    C.
    +127 and -128
    D.
    +127 and -127

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  17. Three Mod-16 counters are connected in cascade. The maximum counting range is

  18. A.
    16
    B.
    256
    C.
    4096
    D.
    none of the above

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  19. TTL is used in electronic calculators.

  20. A.
    True
    B.
    False

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